Laser surgery is a relatively mature and safe surgery to correct refractive errors (myopia, hyperopia, astigmatism). The probability of sequelae is very small if the indications are strictly grasped and the pre-operative and post-operative matters are done well. If the sequelae of the surgery appear, there may be the following situations: 1, dry eye: this is the relatively most occurring situation, especially in the early postoperative period; 2, keratitis: such as bacterial conjunctivitis, viral keratitis, etc.; 3, vision regression: myopia, hyperopia, astigmatism, etc. may appear again; 4, postoperative accidental collision caused by corneal flap misalignment (this will not occur in the surgery without corneal flap); 5, cone cornea (cone) , cone cornea (excessive corneal chipping leads to too thin corneas after surgery). Therefore, the following points should be noted after surgery: 1, you need to insist on regular review after surgery, 2, do not use eye cosmetics within two weeks; 3, moderate eye use within three months, do not do eye massage, do not let dirty water into the eye when washing face, washing hair, do not violently rub the eye, it is best to wear sunglasses when going out in summer. 4. Do less strenuous sports and avoid impact on the eyes. Try to avoid the appearance of sequelae.